Messages in this thread | | | Date | Wed, 27 Sep 2023 01:21:27 -0700 | From | Dan Williams <> | Subject | Re: [PATCH v4 2/6] configfs-tsm: Introduce a shared ABI for attestation reports |
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Thomas Fossati wrote: > Hi Dan, > > > On 9/25/2023 9:17 PM, Dan Williams wrote: > > > +++ b/include/linux/tsm.h > > > @@ -0,0 +1,63 @@ > > > +/* SPDX-License-Identifier: GPL-2.0 */ > > > +#ifndef __TSM_H > > > +#define __TSM_H > > > + > > > +#include <linux/sizes.h> > > > +#include <linux/types.h> > > > +#include <linux/device.h> > > > + > > > +#define TSM_INBLOB_MAX 64 > > I guess @inblob is supposed to (possibly) accommodate nonces from a > challenger, correct? > If so, 64 bytes may not be enough for attesters that produce > EAT-formatted reports -- see [1], and [2]. > > [1] https://www.ietf.org/archive/id/draft-ietf-rats-eat-21.html#section-4.1-5 > [2] https://github.com/ietf-rats-wg/eat/pull/421/files
Hmm, but 64-bytes is the hard limit of the supported platform implementations.
It can be expanded when/if those platforms expand the size of the supported user data, or another configfs-tsm backend arrives that needs that capability.
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